I bought a single box of 20 Federal Hydroshock .380 S.D. stuff about 6 yrs. ago. I had just bought the gun and didn't have any brass to load for it yet. Before that, I bought a 20 Federal Hydroshock 38 spcl. S.D. about 12 yrs. ago for the same reason. Other than that, I can't remember and am thinking it was probably more than 20 yrs. ago. I have bough shotgun shells off and on when I can't find reclaimed shot.
But a year or so ago I made a promise, as did my Son, to never buy factory shotgun shells ever again. We bought some cheap Win. to shoot dove with. Not one single shell we discharged would eject from any of our Remington 870's, we have five 870's consisting of two Wingmaster's, two Express, and an old Special 12 which is a bottom of the line 870 I bought new in 1980 something. An old New England Firearms and a Charles Daley pump wouldn't eject them either. I took several shells apart an found the powder was in one very hard lump. I broke the powder lumps up and reloaded all the original components, and they functioned fine.